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Effects of Soil Organic Matter on the Kinetics and Mechanisms of Pb(II) Sorption and Desorption in Soil

^a Dep. of Plant, Soil, and Entomological Sci., Univ. of Idaho, P.O. Box 442339, Moscow, ID 83844-2339 USA
^b Dep. of Plant and Soil Sciences, Univ. of Delaware, Newark, DE 19717-1303 USA

View larger version (19K): [in a new window]   Fig. 1 Schematic illustrating the experimental design of the stirred-flow experiments

View larger version (10K): [in a new window]   Fig. 2 Sorption isotherm on the untreated Matapeake soil. The solid line is the best fit to the Freundlich equation (Eq. [2])

View larger version (15K): [in a new window]   Fig. 3 Sorption kinetics on Matapeake soil measured by the batch method. The solid line is the best fit to the first-order reversible equation, Eq. [3]

View larger version (21K): [in a new window]   Fig. 4 Results of sorption experiment conducted on Matapeake soil in the stirred-flow chamber, and theoretical tracers calculated by Eq. [1]

View larger version (23K): [in a new window]   Fig. 5 Breakthrough curves for sorption on treated and untreated Matapeake soils, the St. Johns soil, and theoretical tracers

View larger version (14K): [in a new window]   Fig. 6 Breakthrough curves for desorption from the untreated Matapeake soil and theoretical tracer

View larger version (18K): [in a new window]   Fig. 7 Percentage Pb desorbed from treated and untreated Matapeake and St. Johns soils

View larger version (18K): [in a new window]   Fig. 8 k3 Weighted normalized -functions from XAFS experiments for Pb sorption on the treated and untreated Matapeake soil

View larger version (19K): [in a new window]   Fig. 9 Fourier transforms (RSF) of the -functions in Fig. 8 (solid line), and results from multi-shell fits using theoretical backscattering phase and amplitude functions (dotted line). Vertical dotted lines are aligned at the center of the two peaks used for fitting in the untreated Matapeake soil

View larger version (29K): [in a new window]   Fig. 10 Examples of sorption complexes illustrating possible molecular environments for Pb sorbed onto functional groups on a soil mineral (Treated Matapeake Soil) and soil organic matter (Untreated Matapeake Soil) based on the fit results of the XAFS data